linux-kernel - Re: [PATCH] docs: trace: ring-buffer-design.rst: use the new SPDX tag

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Date:   Wed, 26 Aug 2020 06:47:33 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        "Frank A. Cancio Bello" <frank@...eralsoftwareinc.com>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] docs: trace: ring-buffer-design.rst: use the new SPDX
 tag

On Wed, 26 Aug 2020 09:28:24 +0200
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:

> SPDX v3.10 gained support for GFDL-1.2 with no invariant sections:
> 
> 	https://spdx.org/licenses/GFDL-1.2-invariants-only.html
> 
> Let's use it, instead of keeping a license text for this file.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  Documentation/trace/ring-buffer-design.rst | 26 +---------------------
>  1 file changed, 1 insertion(+), 25 deletions(-)

[CC expanded]

If we're going to do this, I think we should also add GFDL to the right
place in the LICENSES directory - deprecated/ or at best dual/.  But even
SPDX (https://spdx.org/licenses/GFDL-1.2.html) says this license is
deprecated.

Beyond that, https://spdx.org/licenses/GFDL-1.2-invariants-only.html seems
to disagree with your interpretation; it seems you would want 
GFDL-1.2-only-no-invariants ?

jon
> 
> diff --git a/Documentation/trace/ring-buffer-design.rst b/Documentation/trace/ring-buffer-design.rst
> index 9c8d22a53d6c..a76435610b58 100644
> --- a/Documentation/trace/ring-buffer-design.rst
> +++ b/Documentation/trace/ring-buffer-design.rst
> @@ -1,28 +1,4 @@
> -.. This file is dual-licensed: you can use it either under the terms
> -.. of the GPL 2.0 or the GFDL 1.2 license, at your option. Note that this
> -.. dual licensing only applies to this file, and not this project as a
> -.. whole.
> -..
> -.. a) This file is free software; you can redistribute it and/or
> -..    modify it under the terms of the GNU General Public License as
> -..    published by the Free Software Foundation version 2 of
> -..    the License.
> -..
> -..    This file is distributed in the hope that it will be useful,
> -..    but WITHOUT ANY WARRANTY; without even the implied warranty of
> -..    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> -..    GNU General Public License for more details.
> -..
> -.. Or, alternatively,
> -..
> -.. b) Permission is granted to copy, distribute and/or modify this
> -..    document under the terms of the GNU Free Documentation License,
> -..    Version 1.2 version published by the Free Software
> -..    Foundation, with no Invariant Sections, no Front-Cover Texts
> -..    and no Back-Cover Texts. A copy of the license is included at
> -..    Documentation/userspace-api/media/fdl-appendix.rst.
> -..
> -.. TODO: replace it to GPL-2.0 OR GFDL-1.2 WITH no-invariant-sections
> +.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.2-invariants-only
>  
>  ===========================
>  Lockless Ring Buffer Design